WO1998002953A1 - Construction de moteur synchrone supraconducteur - Google Patents

Construction de moteur synchrone supraconducteur Download PDF

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Publication number
WO1998002953A1
WO1998002953A1 PCT/US1997/011107 US9711107W WO9802953A1 WO 1998002953 A1 WO1998002953 A1 WO 1998002953A1 US 9711107 W US9711107 W US 9711107W WO 9802953 A1 WO9802953 A1 WO 9802953A1
Authority
WO
WIPO (PCT)
Prior art keywords
rotor assembly
support member
superconducting
core
magnetic material
Prior art date
Application number
PCT/US1997/011107
Other languages
English (en)
Inventor
Bruce B. Gamble
Gregory L. Snitchler
Original Assignee
American Superconductor Corporation
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Application filed by American Superconductor Corporation filed Critical American Superconductor Corporation
Priority to EP97933177A priority Critical patent/EP0913023B1/fr
Priority to AU36431/97A priority patent/AU3643197A/en
Priority to DE69739358T priority patent/DE69739358D1/de
Publication of WO1998002953A1 publication Critical patent/WO1998002953A1/fr

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K55/00—Dynamo-electric machines having windings operating at cryogenic temperatures
    • H02K55/02—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type
    • H02K55/04—Dynamo-electric machines having windings operating at cryogenic temperatures of the synchronous type with rotating field windings

Definitions

  • the invention relates to superconducting synchronous motors and their construction.
  • Iron has been utilized in the field structures of conventional dynamoelectric machines in order to obtain sufficient magnetic flux at critical points of the machines (e.g., within the windings), At the same time, efforts have been ongoing in applying cryogenic technology to dynamoelectric machines.
  • the use of superconducting windings in these machines has resulted in a significant increase in the field magnetomotive forces generated by the windings and increased flux and power densities of the machines.
  • the invention features a rotor construction for an electric motor in which high-permeability magnetic material is positioned with respect to a superconducting winding to reduce the reluctance of the flux path produced by the superconducting winding.
  • a rotor assembly for use within a superconducting electric motor includes a superconducting winding which is formed of high temperature superconductor and, during operation, generates a flux path within the rotor assembly; and a high permeability magnetic material, positioned within at least a portion of the flux path so as to decrease the overall reluctance of the flux path generated by the superconducting winding.
  • the rotor assembly includes a support member having an internal volume and is formed of a nonmagnetic, high-strength resilient material.
  • the support member supports on its outer surface the superconducting winding.
  • the internal volume of the support member supports the magnetic material which is formed as a cylindrically shaped core.
  • the core member provides a low reluctance to a portion of the flux path generated by the superconducting winding.
  • the construction of the rotor assembly offers significant advantages.
  • the superconducting windings are supported on the outside of the support member with the windings extending beyond the ends of the support member and core member.
  • the support member effectively captures the core member, so that, in certain applications, the core member can be cryogenically cooled without significant risk of its fracturing due to oscillatory forces generated by the machine during operation.
  • the invention provides an internally-supported structure which protects the relatively brittle components (i.e., core member) .
  • the rotor assembly design generates higher flux levels for a given number of ampere-turns of the windings, resulting in a more efficient motor.
  • the size of the structure can be reduced without sacrificing performance.
  • the rotor assembly of the invention provides a relatively simple construction which is spatially removed from the superconductor region, while still augmenting the magnetic field generated by the superconducting windings.
  • the rotor assembly described above may include one or more of the following features.
  • the support member may be formed as a cylindrical tube formed of stainless steel having an outer surface which in cross section has a stepped profile for supporting the windings.
  • the core may be formed of iron and may be cylindrically shaped to substantially fill the internal volume of the cylindrical tube.
  • the magnetic material forming the core may be cryogenically cooled.
  • the core is generally captured in radial compression within the internal volume of the torque tube.
  • the core may be formed as a series of stacked laminations, each lamination lying in a plane perpendicular to the longitudinal axis of the cylindrical tube. Thus, any cracks which may form in one or more of the laminations are prevented from propagating through the core structure.
  • the iron core in a rotor construction in which the iron core is maintained at warm (non-cryogenic) temperatures, the iron core may be a solid continuous member.
  • the core is generally spaced from the support member by a vacuum gap to thermally isolate the support member from the core.
  • the vacuum gap may be filled with a multi-layered insulation.
  • the rotor assembly may include an outer electromagnetic shield member surrounding the superconducting winding and support member.
  • the superconducting winding is racetrack-shaped and is formed of high temperature superconductor (HTS) .
  • a method of providing a rotor assembly for a synchronous motor includes providing a core material formed of a high permeability magnetic material; disposing a support member formed of a non-magnetic, high-strength resilient material around the core material; and positioning a superconducting armature winding on an outer surface of the support member.
  • the step of providing the core material includes stacking laminations formed of high permeability magnetic material.
  • the step of disposing a support member around the core material includes shrinking the support member around the core material .
  • Fig. 1 is an isometric, partially cut-away view of a rotor for a superconducting synchronous machine.
  • Fig. 2 is a cross-sectional end view of a portion of the rotor of Fig. 1 taken along lines 2-2 of Fig. 1.
  • Fig. 3 is a cross-sectional side view of a portion of the rotor of Fig. 1 taken along lines 3-3 of Fig. l.
  • Fig. 4 is an isometric, partially cut away view of a racetrack superconducting winding for use with the superconducting synchronous machine of Fig. 1.
  • Fig. 5 is a cross-sectional end view of the magnetic core of the rotor assembly.
  • Fig. 6 is a diagrammatic representation illustrating the flux paths in the superconducting synchronous machine.
  • Fig. 7 is a plot showing the magnetic field distribution within the rotor assembly.
  • Fig. 8 is an isometric, partially cut-away view of an Alternate embodiment of a superconducting synchronous machine.
  • a rotor assembly 10 for a synchronous motor having a four-pole topology is shown without its outer shield which encloses the vacuum layer within the overall assembly.
  • the rotor assembly includes a torque tube 20 fabricated from a high-strength, ductile and non-magnetic material (e.g., stainless steel).
  • the outer surface of the torque tube 20 supports four superconducting winding assemblies 30 (only one shown here) , each winding associated with a pole of the motor.
  • a hollow core member 50 is positioned within the inner volume of the torque tube and whose function will be discussed in greater detail below.
  • Core member 50 is fabricated from a material having a high permeability, high saturation flux density and good magnetic characteristic (e.g., iron). To reduce the weight of the core and, therefore, the overall weight of the assembly, the thickness of the hollow iron core 50 is generally selected to provide a low reluctance flux path while maintaining the iron core below its over-saturated point. In other applications, where the weight of the rotor assembly is of little concern, the iron core may be solid.
  • each of a first diametrically opposing pair of the superconducting windings is wound about a first axis 22.
  • Each of a second diametrically opposing pair of the winding is wound about a second axis 24, transverse to axis 22.
  • the windings are supported along the outer periphery of the tube at stepped profiles 26 formed along axes 22, 24.
  • the windings extend beyond the end of the iron core and torque tube. At these end regions, the windings are spaced from the torque tube by a vacuum layer 31 which is generally filled with multi-layered insulation (e.g., layers of aluminized mylar) . This arrangement ensures that the windings are maintained at their cryogenic temperature while allowing the length of the rotor assembly and motor to be decreased.
  • the torque tube 20 includes end extension members 21 which define warm/cold transition regions between the ambient environment and the cryogenically cooled portion of the rotor assembly.
  • the torque tube 20 also includes a number of cooling ducts 28 which extend through the length of the torque tube and carry liquid or gas refrigerants needed for cooling the superconducting winding assemblies (Fig. 3) .
  • the winding assemblies 30 are secured to the torque tube 20 by pole caps 40 attached at the four polar positions of the rotor and with quadrature caps 42 equally spaced and offset 45° from axes 21, 23 between each pole cap.
  • the pole and quadrature caps are generally fabricated from the same material as the torque tube and, together with the torque tube, form a complete cylinder.
  • each superconducting winding assembly 30 is associated with each pole of the motor and includes racetrack double "pancake" coils 32 positioned within a coil support shell 34.
  • Each double pancake coil has co-wound conductors wound in parallel which are then stacked coaxially on top of each other.
  • the conductor is a high temperature copper oxide ceramic superconducting material, such as Bi 2 Sr 2 Ca 2 CU 3 ⁇ ⁇ , commonly designated BSCCO 2223.
  • the double pancake coils 32 may include a pancake coil having a diameter smaller than its associated pancake coil of the double pancake, the two coils of a pair being wound from the same continuous length of superconducting tape.
  • the preferred embodiments are based on the magnetic and thermal properties of high temperature superconducting composites, preferably including superconducting ceramic oxides and most preferably those of the copper oxide family.
  • the warm and cold iron embodiments cannot be economically justified for low temperature superconductors in part because the addition of iron to the rotor has a significant cost for superconducting motors.
  • Use of the iron rotor does reduce the amount of the superconducting composite used by about 50%. Because high temperature superconducting composites are expensive to manufacture and typically contain large amounts of expensive noble metals, this reduction of superconducting material in the rotor substantially reduces the cost of a high temperature superconducting motor.
  • a 50% reduction of low temperature superconducting material has a insignificant cost benefit to such a device, since the cooling cost, not the material cost, is the primary consideration.
  • the cost of cooling to the vicinity of about 4°K (for low temperature superconductors) is high in comparison to the cost of cooling to about 27°K (for high temperature superconductors) , particularly when the necessity of compensating for eddy currents is factored in.
  • the iron core is formed as a series of stacked laminations 52.
  • the high strength torque tube is typically heated to allow the tube to thermally expand.
  • the stacked laminations 52 which may be cooled, are placed within the inner volume of the tube in its heated state.
  • the torque tube is then allowed to cool so that the tube shrinks around the laminations capturing them in a compressed state within the tube.
  • the torque tube may also be "shrink welded" to preload the stainless steel tube around the iron core.
  • the iron core 50 is captured in radial compression between the torque tube 20 and an inner sleeve 29.
  • a solid iron core member may be used, a stacked set of laminations is preferable so that, in the event that one of the laminations cracks, the crack is isolated to that lamination and will not propagate to neighboring laminations.
  • Cracking in the iron core 50 is a serious concern because the non-ductile iron core is cryogenically cooled along with the superconducting windings 30. At these low temperatures, the brittleness characteristic of the iron is increased.
  • reinforcing layers e.g., fiberglass or stainless steel
  • the laminations and reinforcing layers can then be impregnated with, for example, epoxy.
  • FIG. 6 a simplistic representation of the flux paths generated by each of the superconducting windings is shown in Fig. 6.
  • One of the four flux paths corresponding to the upper left-hand quadrant starts at a point 60 in the iron core, extends in a path 62 running generally parallel with axis 22 until it encounters the back iron member 70 which provides a low impedance path.
  • the flux path extends counterclockwise through the back iron member and, then back along a path 64 parallel to axis 24 toward point 60 to close the loop.
  • the flux paths for the remaining quadrants extend away from the iron core, through the back iron member and back to the iron core in similar fashion.
  • a plot showing the magnetic field distribution within the rotor assembly shows the increased flux lowing through the iron core 50.
  • an iron core 80 is spaced from the inner wall of the torque tube 20 which is cryogenically cooled.
  • the iron core is not cooled but is thermally isolated from the tube by an annular vacuum gap 82.
  • the vacuum gap may be air-filled, but is preferably filled with multi-layered insulation 84 to minimize heat leaking.
  • the iron core 80 is formed with extensions 81 which extend commensurately with torque tube extensions 21.
  • multi-layered insulation layers are positioned within the vacuum gap 82 to increase the thermal isolation between the iron core and support member. Because the iron core 80 is not maintained at cryogenic temperatures, it is substantially more ductile. Thus, it no longer becomes necessary for the torque tube 20 to capture the iron core in a compressed state as was the case in the embodiments described above in conjunction with Figs. 1-3. Moreover, the advantages associated with forming the iron core as a series of laminations are lessened where the core is maintained at ambient temperatures.

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superconductive Dynamoelectric Machines (AREA)

Abstract

Cette invention se rapporte à un ensemble rotor, conçu pour être utilisé dans un moteur électrique supraconducteur, cet ensemble comprenant un enroulement supraconducteur, lequel est formé par un supraconducteur haute température et génère, pendant le fonctionnement, un trajet de flux à l'intérieur de l'ensemble rotor; et un matériau magnétique à haute perméabilité, placé dans une partie au moins du trajet de flux, afin d'abaisser la réluctance globale du trajet de flux. Cet ensemble rotor peut comporter un élément de support qui possède un volume interne et qui est formé d'un matériau résilient haute résistance non magnétique. Cet élément de support maintient en support sur sa surface externe l'enroulement supraconducteur et dans son volume interne le matériau magnétique à haute perméabilité. Ce matériau magnétique peut être conçu sous la forme d'un élément noyau destiné à former la partie basse réluctance du trajet de flux généré par l'enroulement supraconducteur.
PCT/US1997/011107 1996-07-16 1997-06-26 Construction de moteur synchrone supraconducteur WO1998002953A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP97933177A EP0913023B1 (fr) 1996-07-16 1997-06-26 Construction de moteur synchrone supraconducteur
AU36431/97A AU3643197A (en) 1996-07-16 1997-06-26 Superconducting synchronous motor construction
DE69739358T DE69739358D1 (de) 1996-07-16 1997-06-26 Aufbau eines supraleitenden synchronmotors

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US08/682,923 1996-07-16
US08/682,923 US5777420A (en) 1996-07-16 1996-07-16 Superconducting synchronous motor construction

Publications (1)

Publication Number Publication Date
WO1998002953A1 true WO1998002953A1 (fr) 1998-01-22

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/US1997/011107 WO1998002953A1 (fr) 1996-07-16 1997-06-26 Construction de moteur synchrone supraconducteur

Country Status (5)

Country Link
US (1) US5777420A (fr)
EP (1) EP0913023B1 (fr)
AU (1) AU3643197A (fr)
DE (1) DE69739358D1 (fr)
WO (1) WO1998002953A1 (fr)

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WO2001020756A1 (fr) * 1999-09-13 2001-03-22 Siemens Aktiengesellschaft Machine supraconductrice comportant un ensemble enroulement multipolaire
DE10303307A1 (de) * 2003-01-28 2004-08-26 Siemens Ag Maschine mit einem Rotor und einer supraleltenden Rotorwicklung
US6836043B2 (en) 2001-03-06 2004-12-28 Siemens Aktiengesellschaft Engine with a superconductive winding arranged in a winding support and means for transmitting torque from the winding support to a shaft part
DE102004039855A1 (de) * 2004-08-17 2006-03-09 Siemens Ag Maschine mit einer Erregerwicklung aus Hoch-Tc-Supraleitern in einer Halteeinrichtung
US7075208B2 (en) 2002-08-02 2006-07-11 Siemens Aktiengesellschaft Machine with a coolable winding arranged in a winding support and with a torque transmitting device
DE102006027219A1 (de) * 2006-06-12 2007-12-20 Siemens Ag Maschine mit ungekühltem Rotorkörper und gekühlter Rotorwicklung sowie zugeordneter Halte- und/oder Abstützeinrichtung
JP2011041403A (ja) * 2009-08-11 2011-02-24 Kawasaki Heavy Ind Ltd ロータコア及び該ロータコアの冷却方法、該ロータコアを具備する超電導回転機
US9130447B2 (en) 2010-11-08 2015-09-08 Kawasaki Jukogyo Kabushiki Kaisha Rotor core and superconducting rotating machine with the rotor core
WO2017108042A1 (fr) * 2015-12-21 2017-06-29 Envision Energy (Denmark) Aps Éolienne à générateur supraconducteur ayant une structure d'isolation thermique améliorée

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Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001020756A1 (fr) * 1999-09-13 2001-03-22 Siemens Aktiengesellschaft Machine supraconductrice comportant un ensemble enroulement multipolaire
US6836043B2 (en) 2001-03-06 2004-12-28 Siemens Aktiengesellschaft Engine with a superconductive winding arranged in a winding support and means for transmitting torque from the winding support to a shaft part
US7075208B2 (en) 2002-08-02 2006-07-11 Siemens Aktiengesellschaft Machine with a coolable winding arranged in a winding support and with a torque transmitting device
DE10303307A1 (de) * 2003-01-28 2004-08-26 Siemens Ag Maschine mit einem Rotor und einer supraleltenden Rotorwicklung
US7741738B2 (en) 2003-01-28 2010-06-22 Siemens Aktiengesellschaft Machine comprising a rotor and a superconducting rotor winding
DE10303307B4 (de) * 2003-01-28 2010-12-30 Siemens Ag Maschine mit einem Rotor und einer supraleltenden Rotorwicklung
DE102004039855A1 (de) * 2004-08-17 2006-03-09 Siemens Ag Maschine mit einer Erregerwicklung aus Hoch-Tc-Supraleitern in einer Halteeinrichtung
DE102006027219A1 (de) * 2006-06-12 2007-12-20 Siemens Ag Maschine mit ungekühltem Rotorkörper und gekühlter Rotorwicklung sowie zugeordneter Halte- und/oder Abstützeinrichtung
JP2011041403A (ja) * 2009-08-11 2011-02-24 Kawasaki Heavy Ind Ltd ロータコア及び該ロータコアの冷却方法、該ロータコアを具備する超電導回転機
US9130447B2 (en) 2010-11-08 2015-09-08 Kawasaki Jukogyo Kabushiki Kaisha Rotor core and superconducting rotating machine with the rotor core
WO2017108042A1 (fr) * 2015-12-21 2017-06-29 Envision Energy (Denmark) Aps Éolienne à générateur supraconducteur ayant une structure d'isolation thermique améliorée
US10971989B2 (en) 2015-12-21 2021-04-06 Envision Energy (Denmark) Aps Wind turbine with a superconductive generator having an improved thermally insulating structure

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EP0913023B1 (fr) 2009-04-15
EP0913023A4 (fr) 2000-05-24
US5777420A (en) 1998-07-07
EP0913023A1 (fr) 1999-05-06
DE69739358D1 (de) 2009-05-28
AU3643197A (en) 1998-02-09

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